# -*- coding: utf-8 -*-

# Scrapy settings for news_crawler project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://doc.scrapy.org/en/latest/topics/settings.html
#     https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://doc.scrapy.org/en/latest/topics/spider-middleware.html
# HTTPERROR_ALLOWED_CODES = [403]
USER_AGENT = 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'
BOT_NAME = 'news'

SPIDER_MODULES = ['news_crawler.spiders']
NEWSPIDER_MODULE = 'news_crawler.spiders'

FEED_FORMAT = 'json'
FEED_URI = 'result.json'
FEED_EXPORT_ENCODING='utf-8'

# mongodb
MONGODB_SERVER = "localhost"# MongoDB 服务器地址
MONGODB_PORT = 27017# MongoDB 服务器的访问端口
MONGODB_DB = "news"# MongoDB 采用的数据库名
MONGODB_COLLECTION = "articles"# 写入的集合名称

USER_AGENTS = [
    'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0',
    'Mozilla/5.0 (Linux; U; Android 2.2) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1',
    'Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1',
    'Mozilla/5.0 (Linux; Android 6.0.1; SM-G532G Build/MMB29T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.83 Mobile Safari/537.36',
    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/604.5.6 (KHTML, like Gecko) Version/11.0.3 Safari/604.5.6'
]

# ITEM_PIPELINES = {
#     'pipelines.mongoPipeline.MongoDBPipeline': 300
# }

# 自定义的redis过滤器
# REDIS_HOST = 'localhost'# 配置Redis的安装地址
# REDIS_PORT =6379# Redis的连接端口
# REDIS_DUP_DB = 0 			   # REdis去重过滤器的数据库
# DUPEFILTER_CLASS = 'myFilter.redisDupeFilter.RedisDupeFilter'

# # 使用redis bloom过滤器
# SCHEDULER = "scrapy_redis_bloomfilter.scheduler.Scheduler"
# DUPEFILTER_CLASS = "scrapy_redis_bloomfilter.dupefilter.RFPDupeFilter"

# # redis://[user:pass]@host:port/db
# REDIS_URL = 'redis://@localhost:6379'

# Schedule requests using a priority queue. (default)
#SCHEDULER_QUEUE_CLASS = 'scrapy_redis.queue.PriorityQueue'

# Alternative queues.
#SCHEDULER_QUEUE_CLASS = 'scrapy_redis.queue.FifoQueue'
#SCHEDULER_QUEUE_CLASS = 'scrapy_redis.queue.LifoQueue'

# 持久化,不自动清空
SCHEDULER_PERSIST = True

# Store scraped item in redis for post-processing.
# ITEM_PIPELINES = {
#     'scrapy_redis.pipelines.RedisPipeline': 300
# }

# Number of Hash Functions to use, defaults to 6
BLOOMFILTER_HASH_NUMBER = 6
# Redis Memory Bit of Bloomfilter Usage, 30 means 2^30 = 128MB, defaults to 30
BLOOMFILTER_BIT = 30


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'news_crawler (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

# Configure maximum concurrent requests performed by Scrapy (default: 16)
#CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See https://doc.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
#DOWNLOAD_DELAY = 3
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
#COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
#DEFAULT_REQUEST_HEADERS = {
#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
#   'Accept-Language': 'en',
#}

# Enable or disable spider middlewares
# See https://doc.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'news_crawler.middlewares.NewsCralwerSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
#DOWNLOADER_MIDDLEWARES = {
#    'news_crawler.middlewares.NewsCralwerDownloaderMiddleware': 543,
#}
DOWNLOADER_MIDDLEWARES = {
    # 随机User-Agent，UA仿真反爬
    'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware': None,
	'news_crawler.middlewares.RandomUserAgentMiddleware': 800
}

# Enable or disable extensions
# See https://doc.scrapy.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
#}

# Configure item pipelines
# See https://doc.scrapy.org/en/latest/topics/item-pipeline.html
#ITEM_PIPELINES = {
#    'news_crawler.pipelines.NewsCralwerPipeline': 300,
#}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://doc.scrapy.org/en/latest/topics/autothrottle.html
#AUTOTHROTTLE_ENABLED = True
# The initial download delay
#AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
#AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
#AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
#HTTPCACHE_ENABLED = True
#HTTPCACHE_EXPIRATION_SECS = 0
#HTTPCACHE_DIR = 'httpcache'
#HTTPCACHE_IGNORE_HTTP_CODES = []
#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'
